As mentioned in the introduction, all write API methods need to use an http or https POST request.
If you need to use our write api, you have to change the plan of your application to the 'Read & Write' plan in your developer account. This change requires approval by the Jamendo team, so don't forget to complete your application description correctly before applying for read access (application name, description, usage, ...).
As for read methods a response document is always returned. Such a document always contains the headers with status, code and messages and just eventually also contains a specific return value (as the id of the playlist you have created through /setuser/playlist/).
Note that all write methods need the user to be logged in and therefore your application needs to implement an OAuth2 client to communicate with our OAuth2 server.
The Content-type must be "application/x-www-form-urlencoded"